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x-unit

[eks-yoo-nit] /ˈɛksˌyu nɪt/
noun
1.
a unit formerly used to express the wavelength of x-rays and gamma rays, equal to approximately 10− 11 cm.
Abbreviation: Xu, XU.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for xunit

x-unit

noun
1.
a unit of length equal to 0.100 202 × 10–12 metre, for expressing the wavelengths of X-rays and gamma rays
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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